Palmitoylethanolamide and Luteolin for Postinfectious Olfactory Disorders: How Clinically Meaningful Is Its Effect?

Area of Science:

• Otolaryngology
• Neuroscience
• Pharmacology

Background:

• Post-viral olfactory dysfunction, particularly post-COVID-19, is a growing clinical concern.
• Olfactory training (OT) is a standard therapy, but novel treatments are being explored.
• Palmitoylethanolamide (PEA) and luteolin (LUT) possess anti-inflammatory properties with potential therapeutic applications.

Purpose of the Study:

• To investigate the efficacy of combining PEA-LUT with OT for treating post-viral olfactory dysfunction.
• To compare the effects of OT with PEA-LUT versus OT alone in patients with olfactory loss.

Main Methods:

• A randomized controlled trial was conducted with 50 patients suffering from persistent olfactory dysfunction.
• Participants were assigned to either OT with PEA-LUT or OT alone.
• Olfactory function was assessed pre- and post-treatment.

Main Results:

• The group receiving PEA-LUT and OT demonstrated statistically significant improvements in odor discrimination and TDI scores.
• The control group (OT alone) did not show significant improvements.
• Clinically meaningful improvements did not differ significantly between the two groups.

Conclusions:

• PEA-LUT may offer potential benefits for olfactory function in post-viral dysfunction, but its added value to OT alone appears limited.
• These findings warrant further investigation and contrast with some prior research.
• The study highlights the need for clinically relevant outcome measures in olfactory dysfunction research.